In a very general setting, entropy quantifies the amount of information about a system that an observer has access to. However, in contrast to quantum mechanics, in quantum field theory naive measures of entropy are divergent.

At the dawn of general relativity's golden age in the 1950s, Irish mathematician and physicist John Synge proposed to reduce spatial concepts to temporal concepts.

The theory of relativity is generally assumed to provide us with a speed limit for all interactions. Particles cannot travel faster than the speed of light, nor can information. A standard argument for the impossibility of superluminal particles,…

Gravitationally induced entanglement (GIE) offers a potential window into the quantum nature of gravity.

A theoretical issue at the heart of the Measurement Problem in non-relativistic quantum mechanics (NRQM) is that the measurement theory (i.e., the Born rule and state update rules) cannot be derived from the application of the dynamical theory to a…

I will discuss the rigid information geometry of quantum theory, tied to the apparently rigid form of the Born rule, and its necessary generalization in quantum gravity, together with experimental implications that involve intrinsic triple and higher…